What is the difference between == and === ?

Question

we == for comparing value then why === is used.
when we == it only compares value not datatype so when we use === it will compare data type also
ex:5 and '5' are different one int and another is string so it should wrong but it will you true in == becoz..
if you use === then it will you false

Answer 1

== compares only value but === compares both the value and type.
12 == "12" is true
12 === "12" is false since data types are different

Answer 2

in JavaScript:

Semantic wise:
== checks for equality, i.e. it will compare the value of two objects will return true if they are, else false if they aren't
=== checks for identity, i.e. it will compare the value and the type of two object. If both match, then it will return true, otherwise false.

Performance wise:
=== is faster than == since it doesn't cast the type of both to be compared objects. Once it notice that two objects are of different type it returns false. Therefore === is faster than ==.

Answer 3

I can't see the tag

Answer 4

* the "===" operator doesn't exist in htlm, c++ and java

Answer 5

@toky Html is not a programming language, its a markup language.

Answer 6

yep

Answer 7

@xCalifier, I know html isn't a programing language. I mentioned it because he taged it